JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS19] [JJ] Biogeochemistry

Wed. May 24, 2017 10:45 AM - 12:15 PM 302 (International Conference Hall 3F)

convener:Muneoki Yoh(Tokyo University of Agriculture and Technology), Hideaki Shibata(Field Science Center fot Northern Biosphere, Hokkaido University), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Youhei Yamashita(Faculty of Environmental Earth Science, Hokkaido University), Chairperson:Keisuke Koba(Center for Ecological Research, Kyoto University), Chairperson:Michinari Sunamura(University of Tokyo Dept. of Earth & Planetary Science), Chairperson:Rota Wagai(NARO, Institute for Agro-Environmental Sciences), Chairperson:Kazuya Nishina(National Institute for Enviromental Studies)

11:30 AM - 11:45 AM

[MIS19-10] Climate and geochemical controls on soil phosphorus in Bornean tropical rainforest soils

*Rota Wagai1, Yohey Hashimoto2, Kosuke Ikeya1, Shuntaro Hiradate1, Taiki Yokoyama3, Kanehiro Kitayama3 (1.NARO, Institute for Agro-Environmental Sciences, 2.Tokyo University of Agriculture and Technology, 3.Kyoto University)

Keywords:Phosphorus, 31P liquid-state NMR spectroscopy, Tropical forest ecosystems, Biogeochemical cycling, Ultramafic rock

Phosphorus (P) is a major limiting nutrient controlling primary productivity in terrestrial ecosystems especially on highly-weathered soils. It was recently suggested that P depletion during soil weathering may also control long-term ecosystem evolution and plant species diversity. However, the connection between soil P forms and availability, forest productivity, and other ecosystem properties remains uncertain. The stock and chemical forms of soil P in ecosystem development is a fundamental issue because it affects plant and microbial strategies for acquiring P.

Here we examined how climate and parent materials control soil P in tropical rainforest ecosystems on Mt. Kinabalu, northeastern Borneo. We selected the sites developed on two chemically-contrasting rock types (ultramafic igneous and acidic sedimentary rocks) along an elevation gradients. We will present the results of soil P concentration (relative to C and N) as well as P forms assessed by liquid-state 31P NMR spectroscopy using NaOH/EDTA extracts.